Age-Based Fertility Outlook
Age influences egg quantity and quality, shaping the likelihood of conception each cycle. Use this tool to contextualize pregnancy planning.
Each menstrual cycle is roughly one month.
Chance per cycle
20%
Cumulative chance over 6 cycles
74%
Typical 12-month chance
75%
Miscarriage risk (population)
12%
How to Use This Calculator
Select your current age bracket
Pregnancy probabilities change gradually. Choose the range that matches your situation.
Enter the number of cycles you have been trying
The calculator estimates the cumulative chance of conception across the attempts entered.
Use the results to plan next steps
Consult a fertility specialist sooner if you fall into higher-risk age groups or have been trying longer than recommended.
Formula
Per-cycle chance = Age-based fecundability estimate
Cumulative chance over N cycles = 1 − (1 − per-cycle chance)^N
Annual chance = Age-specific typical probability of conceiving within 12 months
Miscarriage risk = Population average for the selected age range
Full Description
Natural fertility peaks in the twenties, remains robust through the early thirties, then declines faster after age 35 as egg quantity and quality drop. This calculator compiles widely cited probabilities to help set expectations for conception timelines. Actual fertility is affected by male factor health, ovulatory function, tubal patency, and lifestyle influences. Use this tool as a general guide alongside personalized medical advice.
Frequently Asked Questions
How long should we try before seeing a doctor?
Under 35: 12 months. Age 35–39: 6 months. Age ≥40: consider immediate consultation.
Do these numbers apply to same-sex couples or donor sperm?
Yes. Age-based egg quality applies regardless of partner sex. Timing and insemination method will vary.
Can lifestyle changes improve fertility?
Maintaining a healthy BMI, limiting alcohol, quitting smoking, and managing stress support overall fertility.
How does male age factor in?
Male fertility declines more gradually, but advanced paternal age (≥45) can increase time to pregnancy and miscarriage risk.